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Fair Value Disclosures (Measurements) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of real estate assets $ 11,065 $ 27,383 $ 1,971  
Discounted Cash Flow Analysis        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of real estate assets   12,100    
The Plaza at Salmon Run, NY        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value investments 7,800 7,800    
Smith's, NM        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value investments 1,900 1,900    
The Manchester Collection, CT        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value investments 46,900 46,900    
Lexington Road Plaza, Versailles, KY        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value investments 4,700 4,700    
Shops at Seneca Mall, Liverpool, NY        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value investments 3,800 3,800    
Remount Village Shopping Center, North Charleston, SC        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value investments 2,200 2,200    
Fashion Square, Orange Park, FL        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value investments 2,400 2,400    
Country Hills Shopping Center        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value investments       $ 100
Milford Center        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair value investments       200
Third Party Buyer        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Impairment of real estate assets   $ 15,300    
Minimum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Terminal capitalization rate   7.00%    
Discount rate   7.90%    
Maximum        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Marketable securities, unrealized losses   $ 100   100
Terminal capitalization rate   8.50%    
Discount rate   9.50%    
Fair Value, Measurements, Recurring Basis | Marketable securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 28,840 $ 28,840   25,573
Fair Value, Measurements, Recurring Basis | Interest rate derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 20,171 20,171   21,605
Fair Value, Measurements, Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Marketable securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 986 986   5,679
Fair Value, Measurements, Recurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 0 0   0
Fair Value, Measurements, Recurring Basis | Significant Other Observable Inputs (Level 2) | Marketable securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 27,854 27,854   19,894
Fair Value, Measurements, Recurring Basis | Significant Other Observable Inputs (Level 2) | Interest rate derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 20,171 20,171   21,605
Fair Value, Measurements, Recurring Basis | Significant Unobservable Inputs (Level 3) | Marketable securities        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 0 0   0
Fair Value, Measurements, Recurring Basis | Significant Unobservable Inputs (Level 3) | Interest rate derivatives        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 0 0   0
Fair Value, Measurements, Nonrecurring Basis | Properties        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 69,652 69,652   285
Fair Value, Measurements, Nonrecurring Basis | Quoted Prices in Active Markets for Identical Assets (Level 1) | Properties        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 0 0   0
Fair Value, Measurements, Nonrecurring Basis | Significant Other Observable Inputs (Level 2) | Properties        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset 0 0   0
Fair Value, Measurements, Nonrecurring Basis | Significant Unobservable Inputs (Level 3) | Properties        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Derivative asset $ 69,652 $ 69,652   $ 285